Question

 (2011年浙江金華十校聯(lián)考)Not until the press reported the pollution________why the water supply had been cut off.

A．people did know                   B．people had known

C．had people known                       D．did people know

Answer 1

解析：選D�？疾榈寡b句和時態(tài)。Not until置于句首時，主句要用(部分)倒裝結(jié)構(gòu)，由此可以排除A、B兩項；另外，根據(jù)reported可知C項時態(tài)不正確。